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|9th July 2003, 03:34 PM||#1|
Join Date: Mar 2003
Location: Lisbon, Portugal
PSU made with power op-amp and small trafo
Guys, I've been thinking...
Correct me if I'm wrong (I love to say this ) on my thoughts.
What I have in mind is from a small and cheap transformer (say, 2x24v/1A) make a good PSU for a GC.
The transformer would at the same time supply the power op-amp and the non-iniverting input.
That is, V+ connected to +IN on one power op-amp.
The other one would have the V- connected to +IN.
On the output of one op-amp you would have + voltage, and on the other one you would have the negative.
The voltage would be the same, because an op-amp won't swing more voltage than it has on the PSU supplying it, no matter what gain you configure it.
I was thinking in OPA541, for instance.
It's unity-gain stable.
My doubt, and the question here, is if I would have more current on the output than the current the transformer has (1A).
Wouldn't it be nice to have a 10A PSU (with OPA541) with a 1A transformer?
Am I dreaming?
|9th July 2003, 03:38 PM||#2|
Join Date: Dec 2001
Location: Pittsburgh, PA, USA
You are essentially using the opamp as a regulator.
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